Preheat the oven to 350°F (175°C). Line your baking sheets with parchment paper.

In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.

Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.

In a separate bowl, whisk together the all-purpose flour, baking powder, baking soda, and salt.

Gradually add the flour mixture to the wet mixture, alternating with sour cream. Mix until just combined; don’t overmix.

In another small bowl, combine the brown sugar, cinnamon, and optional chopped nuts for the topping.

Using a cookie scoop or tablespoon, drop the dough onto the prepared baking sheets.

Sprinkle the brown sugar mixture over each cookie before baking.

Bake in the preheated oven for 10-15 minutes or until the edges are golden and the centers are set.

Allow the cookies to cool slightly on the baking sheet before transferring them to a wire rack to cool completely.